a=3+b,求1/2a²-ab+1/2b²a=3+b,求1/2a²-ab+1/2b²
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a=3+b,求1/2a²-ab+1/2b²a=3+b,求1/2a²-ab+1/2b²
a=3+b,求1/2a²-ab+1/2b²
a=3+b,求1/2a²-ab+1/2b²
a=3+b,求1/2a²-ab+1/2b²a=3+b,求1/2a²-ab+1/2b²
∵1/2a²-ab+1/2b²=1/2(a²-2ab+b²)
=1/2(a-b)²
又∵a=3+b
∴a-b=3
∴原式=1/2(3)²
=9/2